Rifle · Not SAAMI standardized · Not standardizedObsolete
.375 LSR
British long-range target cartridge.
- Caliber
- 0.375″ · 9.525 mm
- Case
- Rimmed
- Parent
- .38-55 Winchester
- Primary use
- target
- Status
- Obsolete
- Obsolete
- Obsolete
- Type
- Rifle
- Origin
- United Kingdom
- Manufacturer
- Various
- Standard
- Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Obsolete
- Availability
- Antique
- Case capacity
- 74 gr H₂O
- Twist (typical)
- 1:12
- Primer
- Large Rifle
- Case type
- Rimmed
- Max pressure
- 25,000 psi, CIP transducer
- Eff. range
- 300 yd
- Max range
- 4900 yd
- Recoil
- 49.1–51.1 ft·lb
- Subsonic
- Capable
Ballistics
Published velocity/energy data isn't available for .375 LSR — an obsolete/collector cartridge. Parent case: .38-55 Winchester.
Performance
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
mixed/other · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 9.53 | 0.375 | ~ |
| Neck ⌀ | 10.42 | 0.410 | |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 12.49 | 0.492 | |
| Rim ⌀ | 14.33 | 0.564 | |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.65 | 0.065 | |
| Neck length | n/a | ||
| Case length | 60.46 | 2.380 | |
| Overall length | 77.19 | 3.039 | |
Missing a dimension for .375 LSR? Some case measurements aren't in a published SAAMI/CIP drawing yet. Have a factory or reamer print? Send it → — verified hard-to-find data earns a free Lindcott sticker.
Factory loads
Being verified
Advertised FPS, energy, and BC are withheld until loads clear verification.
Reloading costestimate cost per round vs factory
Estimate your cost per round and how it compares to factory. Inputs are yours — nothing is stored.
Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.
Lineage
History
A specialized proprietary cartridge from the late 19th century, developed for a specific long-range sporting rifle system. Used in single-shot target rifles for 1,000-yard competition. Represents the era of highly specialized target cartridges before .308 Winchester standardized long-range competition.
FAQs
- What twist rate does .375 LSR use?
- .375 LSR typically uses a 1:12 twist rate.
- What bullet diameter is .375 LSR?
- .375 LSR uses a 0.375″ (9.525 mm) diameter bullet.
- Is .375 LSR still in production?
- .375 LSR is obsolete; typical availability is antique.
- What is .375 LSR used for?
- .375 LSR is primarily used for target.
- What is .375 LSR based on?
- .375 LSR is derived from the .38-55 Winchester case.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 19 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
